How Does Malware Get On My Computer?

Updated on September 28, 2026, by Xcitium

Malware can get on your computer through phishing emails, malicious links or attachments, unsafe software downloads, compromised websites, malicious ads, infected USB drives, fake software updates, and unpatched security vulnerabilities. Some malware requires you to open or install something, while other threats can exploit vulnerable software or spread from another compromised system.

As the cyber threat landscape evolves with each passing day, it’s helpful to understand how malware gets onto your computer. Knowing the methods by which malware works gives you the edge in preventing malware from entering your computer.

Malware, computer worms, and phishing attacks are becoming increasingly common nowadays and are one of the major causes of cybervandalism and cyberespionage. With ever-evolving malware attacks, almost every organization and endpoint are vulnerable to disruption caused by malware.

The term ‘Malware’ includes many types of malicious programs like worms, viruses, trojans, spyware, adware, rootkits, etc. So, if someone says ‘malware,’ it could be any of these malicious programs. It could be spyware which secretly steals sensitive information, or it could be adware which bombards the victim’s computer screen with popup advertisements.

In most cases, malware enters the computer via the internet. Whenever the computer gets connected to the internet, it gets exposed to numerous online malware threats.

Common Ways Malware Gets on Your Computer

Infection Method	How Malware Gets In	How to Reduce the Risk
Phishing email	Malicious attachment or link	Verify unexpected messages
Unsafe download	Malware hidden in software	Download from trusted sources
Malicious website	Website delivers or redirects to malware	Keep browser and OS updated
Malvertising	Malicious ad redirects or downloads	Avoid suspicious ads and pop-ups
Fake update	Malware impersonates an update	Update through official software
Software vulnerability	Attacker exploits an unpatched flaw	Install security updates
USB device	Infected removable media spreads malware	Avoid unknown USB devices
Network attack	Malware exploits vulnerable systems/services	Patch and secure network access

Ways by which malware infects your computer:

Downloading files and software from suspicious websites.
Through infected emails which contain malicious email attachments.
Through malicious content in Instant Messaging platforms similar to email attachments.
Sharing files with infected devices.

Your computer may get infected with malware if you do not follow safe browsing habits. The primary way by which malware spreads are through the internet and pirated software which seems legitimate. Hackers use seemingly benign software to lure unwary users into downloading malware. Hackers blend malware codes with legitimate software to trick users into downloading malicious software.

Unlike in the olden days, anyone can create malware with the help of advanced tools available on the internet. Some hackers create malware for the sole purpose of making money illegally. Ransomware is an excellent example of this, because the malware locks down the victim’s computer in return for money (ransom).

Hackers often disguise the malware as a useful app. Unwary users download the malware considering it as a safe software application. Once installed, the malware then begins to damage the computer.

Apart from disguised as a useful software, malware can also enter your device through phishing links sent via email, text, or through fake requests to perform system/software updates.

Can Malware Spread From One Computer to Another?

Yes. Some malware can spread from one computer to other devices through networks, shared resources, exploited vulnerabilities, compromised credentials, or infected removable media.

Worms are specifically designed to self-propagate.

Other malware may be manually deployed across a network after an attacker gains access.

Businesses can reduce this risk through:

Network segmentation
Vulnerability patching
Strong authentication
Least-privilege access
Endpoint monitoring
Secure remote access

What Should I Do If I Think I Downloaded Malware?

If you suspect malware:

Disconnect from the network if suspicious activity is ongoing.
Do not log in to sensitive accounts from the potentially infected computer.
Run an updated security scan.
Quarantine detected threats.
Remove confirmed malware.
Update the operating system and applications.
Run another scan.
Review important accounts for suspicious activity.
Change compromised passwords from a trusted device.
Contact IT or security personnel if it is a business computer.

Do not immediately delete every suspicious file manually. Security tools or incident responders may need information about the threat to determine what happened.

How To Prevent Malware?

To prevent malware from infecting your PC, you should practice good browsing habits, like not downloading files from shady websites or clicking links from suspicious or unknown sources.

In an organization, it is difficult for IT departments to manage multiple endpoints (computers, mobile device, tablets, etc.). For such scenarios, you need an endpoint protection solution that offers all-around protection.

Xcitium Advanced Endpoint Protection (AEP) is such a solution that offers complete protection across endpoints. Thanks to the ‘Default Deny’ platform and lightweight client in Xcitium AEP, it can quickly prevent malicious software across endpoints without affecting end-user experience.

Try Xcitium Advanced Endpoint Protection today and secure your endpoints once and for all! For more details, contact us at +1 888-256-2608.

Frequently Asked Questions

How does malware get on my computer?

Malware commonly gets in through phishing, malicious downloads, unsafe websites, fake updates, infected USB drives, or software vulnerabilities.

Can malware install itself?

Some malware can exploit vulnerabilities and install or execute without the user intentionally installing it.

Can websites give you malware?

Yes. Malicious or compromised websites can distribute malware or exploit vulnerable software.

Can clicking a link give you malware?

Yes. A malicious link can lead to a malware download, exploit site, or phishing page.

Can opening an email give you malware?

Usually, the greater risk comes from opening malicious attachments, following links, or exploiting an unpatched software vulnerability.

Can a USB drive contain malware?

Yes. Infected removable drives can spread malware between computers.

Can malware spread through Wi-Fi?

Malware does not generally spread merely because Wi-Fi exists, but infected devices can attack other vulnerable systems reachable over the same network.

Does antivirus stop all malware?

No security tool stops every threat. Use antivirus or endpoint security together with updates, safe browsing, strong authentication, and backups.

How can I check my computer for malware?

Run an updated antivirus or endpoint-security scan and investigate unusual system or account activity.

What should I do after finding malware?

Quarantine the threat, update the system, rescan it, review important accounts, and change exposed credentials from a trusted device.

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